Changes to basic_filebuf::sync and testsuite

[Benjamin Kosnik]

Cool. This plus the other fixes solve all outstanding testsuite failures
except for getting the "do the right thing" fix into string ctors. 

Thanks for tracking this down. It was on my list but is now solved, very
nice. 

We need to figure out how to test for this, so that re-direction failures
are caught in the future. . . . 

-benjamin


> 1999-11-15  Scott Snyder  <snyder@fnal.gov>
> 
> 	* bits/basic_file.h: Type of __off parm should be __c_streampos, to
> 	match how libio is calling us.
> 	* src/basic_file.cc (sys_seek): Likewise.
> 	* bits/std_fstream.h (basic_filebuf::sync): Restore sync call.